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680 Chesapeake Dnve ' Redwood City CA 94063 (650)364 9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4D. 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9 t6)921-0100 <br /> Analytical E455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> icp 1551 industrial Road San Carlos CA 94070-41 11 (650)232 9600 FAX(650)232 9612 <br /> Gettler-Ryan -Dublin Client Project ID Unocal SS#2859, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention _Deanna Harding— _ C}C Sample Group_ 9052028-039 _ _ _ _ _ Reported May 28,_1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xyienes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9052032 9052032 9052032 9052032 <br /> Date Prepared 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Date Analyzed 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Instrument i D # HP-9 HP-9 HP-9 HP 9 <br /> Conc Spiked 20ug/L 20vg/L 20Ng/L 60Ng/L <br /> Matrix Spike <br /> %Recovery 85 95 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 95 95 95 <br /> Relative% <br /> Difference 61 00 00 17 <br /> LCS Batch# 9LCS052699 9LC$052699 9LCS052699 9LCS052699 <br /> Date Prepared 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Date Analyzed 5/26/99 5/26/99 5/26/99 5/26/99 <br /> Instrument I D # HP-9 HP-9 HP-9 HP 9 <br /> LCS % <br /> Recovery 90 100 100 98 <br /> Recovery <br /> Control Limits 70-130 70.130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTIC L,#1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> u fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryis to be used to validate the batch <br /> Ilanne Fegley <br /> Project Manager <br /> 9052028 GET <4> <br />